Hexagonal boron nitride (hBN) provides several advantages as a substrate for graphene-based plasmonic materials, as it is an ultra-flat wide bandgap insulator with excellent thermal transport properties. [1]} The flat morphology and uniformity provided by hBN are are desirable as key factors in preserving the transport properties of graphene. [1]} Results of our numerical study clearly elucidate the advantages of the hBN spectral response for low-loss plasmonics applications. We demonstrate in this work that through the combined advantages of graphene and noble-metal films, along with careful choice of substrate material and layer thickness, multilayer systems can be tuned for low-loss surface plasmon resonance (SPR).
